2542758521 has 4 divisors (see below), whose sum is σ = 2553862500. Its totient is φ = 2531654544.

The previous prime is 2542758503. The next prime is 2542758551. The reversal of 2542758521 is 1258572452.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2165971600 + 376786921 = 46540^2 + 19411^2 .

It is a cyclic number.

It is not a de Polignac number, because 2542758521 - 2¹⁸ = 2542496377 is a prime.

It is a super-2 number, since 2×2542758521² = 12931241792236214882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2542758551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5551646 + ... + 5552103.

It is an arithmetic number, because the mean of its divisors is an integer number (638465625).

Almost surely, 2^2542758521 is an apocalyptic number.

It is an amenable number.

2542758521 is a deficient number, since it is larger than the sum of its proper divisors (11103979).

2542758521 is a wasteful number, since it uses less digits than its factorization.

2542758521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11103978.

The product of its digits is 224000, while the sum is 41.

The square root of 2542758521 is about 50425.7723887300. The cubic root of 2542758521 is about 1364.9027416201.

It can be divided in two parts, 25 and 42758521, that multiplied together give a square (1068963025 = 32695²).

The spelling of 2542758521 in words is "two billion, five hundred forty-two million, seven hundred fifty-eight thousand, five hundred twenty-one".